Method for determining effective flame emissivity in a rotary kiln incinerator burning solid waste  

作　　者：Jin-cai DU1,2,Qun-xing HUANG1,Jian-hua YAN1 (1State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China) (2School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China) 

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2012年第12期969-978,共10页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National Basic Research Program (973) of China (Nos 2009CB219802 and 2011CB201500);the National Water Pollution Control and Management Technology Major Projects (No 2009ZX07317);the Solid Waste Creative Team Project of Zhejiang Province (No A2009R50049), China

摘　　要：Temperature is the most important parameter for the improvement of combustion efficiency and the control of pollutants.In order to obtain accurate flame temperatures in a rotary kiln incinerator using non-intrusive thermographic method,the effective flame emissivity was studied.A combined narrow-and wide-band model and Mie scattering method were used to calculate the radiative properties for gases and fly-ash particles under different combustion conditions.The effects of the air/waste ratio and fly-ash particles on the effective flame emissivity were discussed.The results of numerical calculations showed that the effective emissivity decreased from 0.90 to 0.80 when the air/waste ratio increased from 1.0 to 1.8,and the effect of the fly-ash particles was ignorable under the conditions discussed in this paper.Experimental measurement results indicated that the accuracy of the thermographic temperature measurements improved significantly if the setting of the flame emissivity was adjusted according to the air/waste ratio.Temperature is the most important parameter for the improvement of combustion efficiency and the control of pol- lutants. In order to obtain accurate flame temperatures in a rotary kiln incinerator using non-intrusive thermographic method, the effective flame emissivity was studied. A combined narrow- and wide-band model and Mie scattering method were used to cal- culate the radiative properties for gases and fly-ash particles under different combustion conditions. The effects of the air/waste ratio and fly-ash particles on the effective flame emissivity were discussed. The results of numerical calculations showed that the effective emissivity decreased from 0.90 to 0.80 when the air/waste ratio increased from 1.0 to 1.8, and the effect of the fly-ash particles was ignorable under the conditions discussed in this paper. Experimental measurement results indicated that the accuracy of the thermographic temperature measurements improved significantly if the setting of the flame emissivity was adjusted ac- cording to the air/waste ratio.

关 键 词：Thermographic temperature measurement Effective flame emissivity Rotary kiln incinerator Air/waste equivalenceratio 

分 类 号：X705[环境科学与工程—环境工程]